Joachim Low blamed a lack of defensive familiarity for Germany's frailties in their 4-2 defeat against Argentina.
The world champions were second best for long spells of Wednesday's friendly in Dusseldorf, in what was a rematch of July's World Cup final between the two sides.
Manchester United forward Angel di Maria ultimately stole the show this time around, claiming three assists and a goal to guide the South Americans to victory.
Germany had found themselves 4-0 down at one stage, but Andre Schurrle and Mario Gotze - who scored the winning goal in the World Cup final - added some respectability to the scoreline late on.
However, after the international retirements of several key players, such as Philipp Lahm, following the World Cup, Low conceded that a disjointed performance was largely due to the fact that a new-look team had yet to get to fully know each other.
"We've made some defensive mistakes and these errors were directly punished," he said. "Many of the players have never played together, and therefore you have to accept it."
Low is now keen to focus on Germany's opening Euro 2016 qualifier with Scotland in Dortmund on Sunday, adding "Sunday is the [start of] the European Championship [qualifiers] We have to win against Scotland."
Jerome Boateng could be back in the starting line-up for that clash after he missed out against Argentina through injury, although centre-back partner Mats Hummels is not expected to be fit enough to play.
|Coach: J. Löw|
for J. Draxler 33'
for M. Neuer 46'
for M. Gómez 57'
for A. Schürrle 57'
for T. Kroos 71'
for B. Höwedes 77'
|Mourinho tells Ronaldo: Team honours come first|
|Khedira returns to Juve training|
|Celtic v Qarabag: Champions League return of utmost importance, says Collins|
|Pellegrini: Jovetic had to go|
|Manquillo completes Marseille move|
|Schalke reject Juve´s Draxler bid|
|Blanc: Di Maria deal ´close´|
|Di Santo debut ends in stalemate|
|Fire sign Drogba, trade him to Montreal Impact|
|FIFA and UEFA welcome ruling on third-party ownership|
|Juve kick off title defence against Udinese|
|Stoke sign free agent Afellay|
|Benitez confident Ramos will stay|
|Fenerbahce issue warning to fans|
|UEFA Champions League Preview: De Boer confident Ajax are ready for Vienna test|
|Bility: I am the favourite for FIFA presidency|
|Pienaar to miss start of season|
|Vietnam 1 Manchester City 8: Sterling shines as tourists run riot|
|All-Star Keane relishing Spurs clash|
|Shaun Wright-Phillips joins brother Bradley at Red Bulls|
|Inter 0 Real Madrid 3: Rodriguez stunner caps comfortable win|
|Villa sign Ayew|
|Watford complete Berghuis transfer|
|Robben returns to Bayern training|
|Pulis anxious to make West Brom additions|
|David Luiz eager to welcome ´fantastic´ Di Maria|
|Fernando injury free ahead of new campaign|
|Hummels blames weight issues for poor season|
|Defoe hoping for early Sunderland goals|
|Depay hints at identity of ´surprise´ United striker|
|Tigres UANL v River Plate: Hosts look to bounce back and make history|
|Crespo set for Villa move|
|Terry: I would never join a Premier League rival|
|Van Gaal coy on United future|
|Romero to cover potential De Gea exit - Van Gaal|
|Uruguay win men´s football gold at Pan Am Games|
|Pirlo thanks New York City fans for ´beautiful´ welcome|
|Mexico capitalised on ´the mistakes we made´ - Schafer|
|Herrera delighted with Mexico display|
|MLS Review: Whitecaps build happy home, Pirlo debuts|
|Guardado wins Golden Ball at Gold Cup|
|NZF confirms Olympics disqualification appeal|
|Jamaica 1 Mexico 3: CONCACAF giants complete form turnaround|
|New York Red Bulls 2 Benfica 1: Another scalp for MLS side|
|Romero signs with United|
|Moghreb Tetouan 1 Al Hilal Omdurman 1: Visitors go top|
|Van Gaal rules out Ronaldo bid|
|Pique open to Barca captaincy|
|Pirlo makes MLS bow in thrilling NYC victory|
|Coutinho and Can return for Liverpool U21s|
|Walcott deal ´closer´, says Wenger|
|Arsenal 1 Wolfsburg 0: Walcott the match-winner in Emirates Cup finale|
|Di Santo links up with Schalke squad|
|Lukaku treble sinks Hearts|
|Benitez again refutes Ronaldo rift rumours|
|Pepe sure Ramos will stay at Real|
|City target De Bruyne named Germany´s Player of the Year|
|Montero spoils McCarthy´s Palace debut|
|Lyon 0 Villarreal 2: Soriano, Baptistao seal comfortable win in Emirates Cup|
|Wijnaldum on target as Newcastle are held|
|Mourinho: Rivals trying to buy the title|
|Jovetic set for Inter medical|
|RFS in ´denial´ over racism issue, claims Football Against Racism in Europe|
|Salah not staying at Chelsea - Mourinho|
|Mbemba closes in on Newcastle switch|
|Ibrahimovic: Di Maria will take PSG to another level|
|Delph: Don´t compare me to Pogba|
|Dundee United sign Sneijder|
|Morata relishing new-look Juve strikeforce|
|Strachan "not scared" of England after World Cup qualifying draw|
|Brazil claim football, basketball, handball gold in Toronto|
|Lampard´s debut delayed again, Pirlo ready to play|
|Mourinho open to Premier League matches in US|
|MLS Review: Texas unites to hurt Galaxy|
|Luis Enrique: United can emulate Barca revival|
|Van Gaal singles out Januzaj, hails United´s forwards|
|Blanc still hopeful PSG will sign Di Maria|
|Irish international Cunningham seeks Bristol City exit|
|Italy embracing Spain challenge in World Cup qualifying|
|Dos Santos brothers in doubt for Gold Cup final|
|PSG 1 Chelsea 1 (aet, 5-6 on penalties): Courtois clinches victory for Mourinho´s men|
|United States 1 Panama 1 (aet, 2-3 on penalties): Mejia denies hosts third|
|ES Setif 1 Al Merreikh 1: Sudanese deny title-holders at home|
|CONCACAF admit referee errors in Gold Cup semi-final|
|Dutch favourites in Group A - Deschamps|
|Barcelona 1 Manchester United 3: Rooney, Lingard and Januzaj maintain winning start|